Switching from seedling to veg feeding

I use flora series in my DWC! If growing from seed I’d wait about a week and then start with half of what GH recommends! Shoot for 100-250 ppm. Start low and add. All equal parts at this point!

No need to separate as seedling and early veg. especially in a dwc setup. once a seed sprouts,it is a plant in my opinion. you should feed from day 1 and no need to make big changes during vegetation. You are already burning your plants, back off with nutes, too much for this stage.

Correct to some extent, yes. I would say roughly 2 weeks, the height you are at looks ready. I wouldn't go full strength though, I would work it up.

Soon as a seedling opens it first set of leaves it can take full strength nutrient, that is in an inert medium in soil nutes are there already for it. bit of a case when do you want to call it a plant so many people say different things with pictorial guidance as well you can pick your words.